linux-kernel - Re: [PATCH v2 2/3] mm/compaction: pass only pageblock aligned range to pageblock_pfn_to

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Message-ID: <56BB3278.3020907@suse.cz>
Date:	Wed, 10 Feb 2016 13:52:08 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Aaron Lu <aaron.lu@...el.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 2/3] mm/compaction: pass only pageblock aligned range
 to pageblock_pfn_to_page

On 02/04/2016 07:19 AM, Joonsoo Kim wrote:
> pageblock_pfn_to_page() is used to check there is valid pfn and all pages
> in the pageblock is in a single zone. If there is a hole in the pageblock,
> passing arbitrary position to pageblock_pfn_to_page() could cause to skip
> whole pageblock scanning, instead of just skipping the hole page. For
> deterministic behaviour, it's better to always pass pageblock aligned
> range to pageblock_pfn_to_page(). It will also help further optimization
> on pageblock_pfn_to_page() in the following patch.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>